[ddc] Format dart_library.js
[ddc] Format dart_library.js

Just some preliminary formatting to make it easier to see the diffs
when I merge the changes from the version in google3. The diff
algorithm gerrit uses doesn't handle the change in indentation very
well.

Change-Id: I2a4daa50d0051140569d51bea5845a0366ba1dad
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/180700
Reviewed-by: Sigmund Cherem <beaea8fd7d2a56555046ba4f362c8a93e3938576@google.com>
Commit-Queue: Nicholas Shahan <03847abd2d8aadfe859ecb98095a31f9f515dc47@google.com>

dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk,dart-lang/sdk